| Essential SQL

Looking to up your SQL Skill? Then you need to learn sub queries. Check out our super popular online course priced with you in mind: https://www.udemy.com/course/sub-query-magic-write-t-sql-subqueries-using-sql-server/?couponCode=YOUTUBE202210 So what is a subquery? Simply is is a query inside another. Let's take a quick look at how subqueries are used in SQL Server, PostgreSQL, and MySQL.